Canonical Wnt signaling inhibits osteoclastogenesis independent of osteoprotegerin.

Canonical Wnt signaling inhibits osteoclastogenesis independent of osteoprotegerin.
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DOI:
10.1083/jcb.201207142
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发表时间:
2013-02-18
期刊:
The Journal of cell biology
影响因子:
--
通讯作者:
Schinke T
Schinke T
中科院分区:
其他
文献类型:
--
作者:
Albers J;Keller J;Baranowsky A;Beil FT;Catala-Lehnen P;Schulze J;Amling M;Schinke T

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通过Fzd 8和β-catenin的典型Wnt信号传导负调节破骨细胞分化并减少骨吸收,而不依赖于骨保护素。尽管Wnt信号传导被认为是骨形成的关键调节途径,但成骨细胞中β-连环蛋白的失活并不影响其活性,而是由于骨保护素(Opg)的产生不足而导致破骨细胞生成增加。通过监测小鼠组织和骨细胞中编码Wnt受体的所有已知基因的表达模式,我们将Frizzled 8(Fzd 8)鉴定为骨重建的候选调节因子。Fzd 8缺陷小鼠表现出骨量减少,骨形成正常,破骨细胞生成增加,但这种表型与成骨细胞Wnt信号传导或Opg产生受损无关。在体外和通过产生在破骨细胞谱系中缺乏β-连环蛋白的小鼠证实了经典Wnt信号传导对破骨细胞生成的推断的直接负面影响。在这里,我们观察到骨吸收增加,尽管正常的Opg生产和抵抗Wnt 3a的抗破骨细胞生成作用。这些结果表明,Fzd 8和β-连环蛋白不依赖于成骨细胞而负调节破骨细胞分化,并且经典Wnt信号传导通过两种不同的机制控制骨吸收。
Canonical Wnt signaling through Fzd8 and β-catenin negatively regulates osteoclast differentiation and reduces bone resorption independent of osteoprotegerin. Although Wnt signaling is considered a key regulatory pathway for bone formation, inactivation of β-catenin in osteoblasts does not affect their activity but rather causes increased osteoclastogenesis due to insufficient production of osteoprotegerin (Opg). By monitoring the expression pattern of all known genes encoding Wnt receptors in mouse tissues and bone cells we identified Frizzled 8 (Fzd8) as a candidate regulator of bone remodeling. Fzd8-deficient mice displayed osteopenia with normal bone formation and increased osteoclastogenesis, but this phenotype was not associated with impaired Wnt signaling or Opg production by osteoblasts. The deduced direct negative influence of canonical Wnt signaling on osteoclastogenesis was confirmed in vitro and through the generation of mice lacking β-catenin in the osteoclast lineage. Here, we observed increased bone resorption despite normal Opg production and a resistance to the anti-osteoclastogenic effect of Wnt3a. These results demonstrate that Fzd8 and β-catenin negatively regulate osteoclast differentiation independent of osteoblasts and that canonical Wnt signaling controls bone resorption by two different mechanisms.
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